Fuse



A. L. EUSTICE,

v FUS-E. APPLICATION FILED SEPT. 13. 191B.

Patented Apr. 4, 1922.

\j rtcll afdcey I ALFRED L. EUSTICE, OF CHICAGO, ILLINOIS.

FUSE.

Specification of Letters Patent.

Application filed September 3, 1918. Serial No. 252,334.

To all whom it may concern;

Be it known that I, ALFRED L. EUSTICE, a citizen of the United States, residing at Chicago, in the county of Cook and State of. Illinois, have invented certain new and useful Improvements in Fuses, of which the following is a specification.

This invention relates to fuses. and particularly to the removable cartridge type of fuse.

The object of this invention is to simplify and improve the construction of the cartridge type of fuse, whereby the parts thereof'cooperate in a novel and efiicient manner to meet the various requirements for success ful commercial use.

This and other objects are accomplished by means of the construction disclosed by the accompanying sheet of drawings, in which- Figure l is a side elevation. parts being in section, of my improved fuse.

Figure 2 is a detail side elevation of one of the two knife blade contact terminal members disclosed in Figure 1,

Figure 3 is a detail perspective view of a collar which is fitted over the narraw neck portion of the knife blade terminal.

Figure t is a detail perspective view of an associated member also mounted over the narrow neck portion of the knife blade terminal,

Figure 5 is a side elevation of the knife blade terminal with the parts shown in Figures 3 and 4 applied thereto,

Figure 6 is a longitudinal sectional view, and Figure 7 an end elevation of the threaded member which is fitted i'" 0 each end of the shell,

F igure 8 is an end elevation, and Figure 9 a side elevation of a disc for preventing rotation of the knife blade contact terminal and associated members mounted thereon,

Figure 10 is an end elevation of the fuse, and

Figure 11 is a sectional view taken in the lane of line 11-1l of Figure 1.

The various novel features of my invention will be apparent from the following description and drawings, and will be particularly pointed out in the appended claims.

Referring to the drawings, it will be noted that I have provided a shell 15 formed of some suitable insulating material. such as fibre, in each end of which is fitted a ferrule l6, the smaller externally threaded portion 17 of which is screwed into the end of the shell 15. The larger externally threaded portion 18 of the ferrule 16 projects beyond the edge of the shell and receives a threaded cap 19 to be referred to later. The ferrule 16 is formed to provide upon the shell. at its outer end, a cylindrical end opening. This is defined in the illustrative embodiment by an inwardly extending circular flange 20, and this flange is provided with oppositely arranged notches 21, so that the shell may be said to have a notched cylindrical end opening. A knife blade terminal 22, at each end of the fuse, is provided with a reduced neck portion 23 having therein a hole 24 for the reception of a bolt or other means by which a fuse link 5 can be secured thereto. Surrounding the neck 23 of each knife blade terminal member 22 is a washer 26 having a rectangular opening 27 through which it fits the neck, and a cylindrical periphery through means of which it fits the cylindrical end opening of the shell. shoulders 28 formed on the knife blade contact 22. Also mounted over the narrow neck portion 23 of the contact terminal is a member 29 also having a rectangular opening fitting the neck 23, and provided with 0ppositely arranged lugs or shbulders 3 i, adapted to pass through the notches of the end opening. The members 26 and 29 may be formed integrally with each other. They are secured against longitudinal displacement upon the neck of the knife blade 22, as, for instance, by striking up fillets of metal at 31, as shown in Figure 5 of the drawings. hegvvasher 26 and lug bearing member 29 thi isiconstitute a shouldered collar'on the terminahand provide it with a cylindrical ortion having a circumferentially restricted shoulder or shoulders.

In assembling the contact inner end is passed through opening formed by the circular flange 20 of the member 16,- the projections or shoulders 31 passing through the notches 21 in said circular flange. When the projections 31 have passed into the notches '21 sufiicientl 1 to permit a turning movement of the kni e blade contact, the latter is turned, whereby the knife blade contact is locked against terminal, the the circular Patented Apr. 4, 1922.

This washer 26 abuts longitudinal movement by the shoulders 28 and 31 engaging opposite walls of the en" cular flange 20,'it

portion 26 is of substantially the same width as'the width of the circular flange 20. To prevent rotation normally of the knife being understood that the Y blade contact :22. and the associated bal'llc washemounted thereon. a disc 32 is pro- \ided. said disc having a central opening 325 For the reception of the knife blade contact, the opening 33 preferably being just large enough to accommodate the knife blade contact. The under side of the disc 32 is provided with a plurality of diametrically a1. ranged projections 34 which pass into the notches :21 in the circular flange 20. thereby locking the knite blade against rotation. .in end cap 19 is provided for each end of the shell. said end cap having an integrally threaded portion for cooperating with the threaded portion 15% of the member to. the end cap in each case being screwed inwardly to the extent that its inwardly extending llange 35 presses against the outer side of the disc 3; for locking all oi the parts in their normal positions.

Since the disk 32 extends outwardly to receive the end cap. it will overlie and seal the joint between the cylindrical bearing faces of the terminal and end opening.

lt will be appreciated that it desired only one notch 21 may be i rovided in the l'lauge 2t). and only one projection 34 be provided on the disc 32. or any other number oi notches and projections may be provided. The disc 32 also prevents an cndwise discharge of gases which. may be formed by blowing ot the fuse. the gases being directed radially outwardly through grooves Iltl. r gistering with the notches 21. the grooves 36 leading to the threaded portion 18 along which gases may escape.

From the foregoing it will be seen that the end flanges on the shell. with which the terminals 22 interlock. may remain permanently with the shell in the disassembly ol llu terminals; that nothwithstanding assembl ol' the pair of terminals and the connecting 'l'usible linlc outs de the shell. they can be assembled with the fixed end llanges on the shell by passing them cndwise through these l'iangcs and through the shell while the blades are in the longitudinal plane of the notches of said (hinges. and until disks iii coincide with the flanges. and then interlocked against longitudinal dis placement by a partial rotation ol the blades: that in this turning movement. and during use. said disk 26 provides a cylindrical bearing for the terminal within the. flanges. and so centers and stabilizes the terminal; that the terminals are locked against rotation hack to the releasing point by means of locking disks 32. which have delinitc seating positions upon thr liangcs. and so insure alincment ot the terminal blades: in one and the same axial plane: also that the caps which hold the locking disks in assen'ibly are free to rotate for s rewing to and from position. and are threaded upon thq' same integral parts that carry the flanges; and. linally, that in the assembly the joints between the parts are etl'ectindy closed against escape of gas except through the notches 21. ducts 3G. and screw threads 13, which provide a long controlled passageway that relieves the gases of any harmful effects.

It is my intention to cover all inoditica tions of my invention falling within the. spirit and scope of the following claims.

What I claim is:

1. In a fuse, a shell provided with a cylindrical end opening having a notch in the cylindrical Wall thereof. a terminal member constructed with a cylindrical portion fitting the cylindrical end opening and having a circum ferentially restricted shoulder adapted to pass through the notch and to a position tor interlocking the terminal and shell longitudinally. a disk fitting a portion ot the terminal to prevent relative rotation between the disk and terminal, and an end cap clamping the disk upon the shell.

2. In a fuse. a shell provided with a cylindrical end opening having a notch in the cylindrical wall thereol a terminal. member constructed with a cylindrical portion fitting the cylilulrical end opening and having a circumtercntially restricted shoulder adapted to pass through the notch and to a position tor interlocking the terminal and shell longitudinally. a disk litting a portion of the terminal to prevent relative rotation between the disk and terminal and adapted to interlock with the shell to resist rotation. thereon. and an end cap securing the disk upon the. shell: said disk overlying the joint between the cylindricll surfaces of the terminal and the end opening.

3. in a t'use. the combination ol a shell hav ing a cylindrical end opening. a knife, blade terminal having fixed thereon a cylii'idricai collar adapted to lit the cylindrical end opening. and a circ-iun'lorentially restricted shoulder adapted to engage the wall of the end opening lmigitudinally oi the shell; said, wall being notched to admit said shoulder. and means being provided for securing the terminal against rotation upon the shell.

4-. in a fuse. the cmnbination or". a shell. an associated member having a flange portion with a notch therein. a terminal member having a shoulder portion. a membe mount ed on said tern'iinal member and having a. shoulder portion which is receival'ile by said notch. said shoulders and flange cooperating normally to prevent longitudinal movement of the terminal member. a disc titted. over said terminal member and having aprojecl'ion receivable by said notch normally to prevent turning movement of the terminal member, and means for holding said disc in a locked position.

5. In. a fuse the combination of a shell, 2.

lOO

said notch normally for preventing a turnflange normally preventing longitudinal movement of said contact member, an apertured disc for receiv ng the contact memher and having a projection receivable by ing movement of said terminal member, and an end cap for holding said disein locked position. v

6. In a fuse, the combination of a shell, a threaded member mounted'in the end of the shell and having a flange with a notch'there in and with' a groove re notch, a terminal mem r having means associated therewith including oppositely arranged shoulders, one of which 18 receivable by said notch, said shoulders and'flangecooperating normally to prevent lon itudinal movement of the terminal mem er, a"

disc fitted over said terminal member and havin a projection receivable by said notch norma 1y for preventing turning movement of said'terminal member, said disc preventing gase ,v passing radially inwardly .'-toward contact member, and for directing'such gases ontwardly through said groove,. and

means normally for holding the in a locked position.

7IIn 'a cartridge mse, a shell, and a terminal" blade constructedrespectively with an internal and an external. cvlindrical por-- stering with said.

tion, said cylindrical portions fitting the one around. the other to provide a bearingwhich stabilizes the blade in all directions; said cylindrical portions being assembled by relative 'axial movement of the members; and said members havingoverla'pping projections interengaged by rotation to interlock the parts against separation after their cylindrical portions have been brought into coincidence.

8. In a cartridge fuse, the combination of a shell having a cylindrical end opening, a terminal blade havin a reduced neck leaving a shoulder on he blade which limits the introduction of the blade into the shell, a cylindrical collar fixed u on the reduced neck of the terminal and drical end opening of the shell, and means for securing the terminal against withdrawal from the shell.

' 9. In a cartridge fuse, the combination of a shell and aterminal blade, provided the one with a notched flange andtheother with shoulders adapted to pass through the notches of the flange and. to engage therewith by partial relative rotation of the shell and blade, a shouldered member havin a cvlindrical bearing portion fitting wit llIl t e'flan and stabilizing the su port of the termina upon the shell, and'a ocking disk which fits the terminal blade and has a seat upon the shell to resist rotation'of the blade to unlocking sition.

Signed at hicago, Illinois, this 29th day of August, 1918. o

ALFRED L. E-USTICE.

tting the cylin- 

